Mixture-governing device for internal-combustion engines



P. s. TICE. MIXTURE GOVERNING DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JULY17, 1919- Patented July 26, 1921.

UNITED STATES P ATENT OFFICE.

PERGIVAL s. rrcn or cnicaeo, ILtmoIs,

To all whom it may concern:

Be it known that I, PERCIVAL S. TIOE, a citizen of the United States, residing at Chicago, in the county of Cook and the State of Illinois, have inventedcertain new and useful Improvements in Mixture-Governing Devices for Internal-Combustion Engines, of which the following is a specification, reference being had to the accompanying drawings, formmg a part thereof- The purpose of this invention is to provide an improved device'for the purpose of governing the mixture supplied to an inter; nal combustion engine through the carbureter. It consists in the elements and features of construction shown and described as indicated in theclaims.

In the drawings: Figure -l s a section axial with respect to the inlet of the portion of the intake passage of an engine equipped with this invention.

Fig. 2 is a modified form of the device,

adapted to be interposed between the 'carbureter and the engine intake passage.

Fig. 3 is a section at the line C on-Fig. 1. The present invention is designed to govern the mixture supplied to an internal combustion engine by governing the valve which controls the inlet or suction passage so as to vary its opening by variation of theforce ofthe suction due to varying speed of the engine. The invention here shown is an improvement upon or addition to the invention shown in my Patent No. 1,305,320, dated June 3, 1919. The general type of construction of the inlet valve and its relation to the carbureter being substantially the same as that shown in said patent; and of these substantially identical features of construction only a limited description will be here required.

In the drawings, Fig. 1 shows the present invention applied 'to the intake passage of an engine having the intake passage in a substantially familiar form, said intake passage with the adjacent outline of the engine being shown at A, terminating in the opening through the boss, A adapted to have secured to it a fitting comprising the parts embodying the present. invention. These parts comprise a body piece, B, which contains the, inlet throat-way to the intake passage. This throat-way or inlet passage is formed as shown, with a venturi-shaped inlet throat having its apex or constriction Specification of Letters Patent. v

Application filed July 17,

Patented July 2o, 1921. 1919. Serial N0. 311,484.

at the transverse plane, C of the hourglass shaped throat-piece, C, which for convenlence of construction is stamped or spun out of sheet metal and which is passed into the cylindrical counter-bore, 6 at the outermost end of the part, B,'to the shoulder which is formed by said counter-bore b, and retalned by a spring ring, C operating as a key, snapped into a groove, '6 near the outer end of the counter-bore. The inner wall of the inlet member, B, from the shoulder of the counter-bore to the inner end, is sloped or tapered in continuation of the slope of the inner end portion of the member, C, to com inlet throat. t the inner end of said venturi throat which extends to the inner end of said inlet fitting, B, there is provided a seat, Z2 for the valve, F, which is hollow with a spheroidal outer end, F and a substantially fiat inner end, F and which is made in two piecesin order to admit to its chamber a piston-wise operating member, G.

This iston-wise operating member is carried rigidly at the inner end of a stem, H,

which is situated axially with respect to the valve seat and venturi inlet throat. For

holding it rigidly in this relation, it is pref-- erably formed integrally with the fitting, B, which has radial arms, H extending inward to said stem, H. The spheroidal head,-

F of the chambered valve, F, has its central aperture by which it is adapted to be entered on the guide stem, H, fitted with a sleeve, f, which afi'ords bearing for' the sliding of the valve on said guide stem. Around said stem within the valve chamber, having one end seated upon the inner surface of the i said spherical head, F around the sleeve, f,-

and the other end seated against the fixed piston-wise operating member, G, there is provided a spring, L, reacting between said piston-wise operating member and the valve, for normally holding the valve seated on the seat, 6 at the inner end of the inlet fitting, B, which is also the inner end of the'venturi inlet throat. The guide stem, H, is utilized as an-air inlet conduit affording atmospheric communication to the porn, it which is partitioned by the piston-wise operating member, G, into the two portions, 7 and i, said portion, f being on what may be called the suction side of said piston-wise operating member. For the purpose'of serving as such conduit, the stem has i stem, H, said turn-cock v s'sp the p 9f let, being adj us member in its-seat in the counter-bore ment -ioned-; and for that purpose said turn-cock an axial duct, h, opening at the inner end beyond the piston wisegoperating member, Gr,aud at the outer. end openingby'means of a transverse passage, h, in -the venturi inlet throat substantiallyatWhe transverse lane of the eonstriction,-that is, the plane,

The other end of the stem, H, may be fitted with a valve device for re lating the air inlet to the duct, h; and suc .valve de-' vices in the structure represented in Fig, 1, is of the 'member,

the axial duct,

sequent eflectivje member has a lever arm, K, which may be connected in any convenient manner for opduct to the cavity, f, "wise'operatin member through 'valve'is open,

3 action of said operates suction-wise erate contrari'wise of the general suction crating of the valve for open ng t against with its intake at v erates as an automatic overning means for 55 viz., the ack 2 plus the increasing not being shown in the drawings; Independently of i trol' "of the 4 ing a1 diminish higher velocity.

orationeither'byhand or automatically from some-moving part, such connecting means .any m'eans fo'r man ual, or other-automatic mechanical conatmosphere inlet afforded b the duct,

pheric pressure admitted through said between the piston- G, and the inner head of 'th'e' cham r of the valve,"is automatically modified by the 'air current entering the venturi inlet throat when theby reason of the entrainment air current passing the constriction of the venturi, tending to produce a high vacuum at and just beyond the plane,

throug the duct, h, to re'duce'the atmospheric pressure in the chamber,'f. Such reduction of pressure in said chamber it will be understood, willfp 0P1 the reslstance of the spring, L,tl1'ereby tendmore. as the in -drawn air current has a It will be seen, therefore, that'the provision of the atmosphere inlet the venturi constriction op the-valve, the suction w ich opens the valve being op osed by a resultant of that suction,

suction through the duct, h,-

resistance of the spring as the valve opens. .The resultant openingopposing suction produced through the duct,

h, is dependent upon two factors,-(a) the capacity of the duct, as determined bythe. of openness of'the tum-cock valve K,

de an i the air velocity at'the venturi constriction.

With the first factor constant, the

h, the degree ofatmos--.

This entrainment 'and' artiai-vacuumopposed valve-influencing forces will become cases to have the l maintenance of a certain-known speed, and

for that purpose it. is desirable to have'the engine equipped with the governi device, invariable as to the adjustment of t (b), so that it shall notbeliable to be put out of condition for greatest efliciencyin the work to which it is applied. For this u1'-" be embo ied ose the present invention may in the'form shown in Fig. 2, in which the intake assage of the device, including the valve-chamber and the venturi inlet throat,

e factor is formed and-contained in'a body'member which is adapted to be interposedpermanently between the carbureter and the fixed intake passage of the en 'ne, and for that purpose has only substantially the necessary. length roper range of movement, and the venturi inlet throat, and which terminates at the oposite end in fiatfaced flanges adapting it orsecurement at one end against. the customary flat faced flange about the mouth 'of the engine intake passage, and at the other end to have secured to it a carbureter body provided with the'usual flat faced flange for attachment. In this Fig. '2 theoperating parts are substantially as already shown, exce t that the turn-cock,'B,I- is wanting, and sald identical parts are indicated by the same characters applied to these parts in Fig.1. T-he intake bod is shown com osed of two parts, M and secured toget er substantially at the transverse lane of the valve, for convenience of inclosing the valve in the fchamber between the two parts, the part, M,

having at one end the flange, M for securto accommodate the valve and its securm the carburetor (not shown).-

' It wi 1. be understood that there must be substantial freedom, of atmospheric communication with the chamber f and it will also be understood that the sleeve must move freely on thefixed stem in all movements of the valve; that is that friction between the pla'rts at that point should be negligible. hese two requirements are mutual, in-that the necessary looseness of fit of the sleeve on theistem'provides .for. the necessary freedomof atmospheric communication. The air acoess around the stem at the. bearing of the sleeve thereon is .too v slight to be indicatedin the drawings without misleading exaggeration; but thef-act the opening of the valve the opposite end the terminal flange, N, for

of atmospheric access is indicated conventionally, by showing a leak-port F9, in the outer wall of the valve. But, as above indicated, the actual presence of a leak-port other than that afforded by the-free moving fit of the sleeve on the stem; is not required.

I claim: 4

'1. In combination --with a suction passage,

it having a venturi-shaped inlet throat; a

valve controlling theinlet seating outwardly at a seat located inward from the venturi constriction; a chamber and a'memberopv erating piston-wise therein cooperatively associated with the valve for relative movementfof the ,valve; whereby the entrainment pull or suction operates on the valve counter to the direct suction of the engine.

2-. In the construction defined in. claim 1, the chamber being formed in the body of the valve, the piston-wise operating member being fixed: in position; wherebythe relative piston-wiseoperation is effected by movement of the chamber onsaid fixed member;

I a stem rigid with the intake passage 'wall H on which the valve moves, and which carries said fixed, piston-wise operating member, the conduit for the venturi throat of the chamber being formed in said stem.

, 3. In the construction defined in claim 1, the two portions of the chamber into which 1 it is partitioned by the piston-wise operating member therein, one on the side of ap proach to each other of said ;member and the chamber wall in the valve-opening movement, and the other on the side of aproach in the valve-closing movement, hav-. ing bleeder or leak communications respectiv'ely, with the atmosphere and with the suction.

4. The structure defined in claim 1, formed with the wall or body of the suction intake passage terminated at opposite sides of'the valve and .venturi inlet throat respectively with means for joining it at said opposite sides respectively to a further intake to the engine to be 'served and to a carbureter; whereby the device comprising the valves and venturi and the inclosing and sustain-' ing wall constituting intake passage, is adapted to be permanently interposed be-- the carbureter' and the tween and secured to en me lntake.

n.=testimony whereof, I have-hereunto set my hand at Chicago, Illinois, this 14th" day" of July, 1919.

PEROIVAL TICE. I 

